摘要
基于武汉地铁27号线纸坊出入场线大跨度矿山法隧道工程实际,根据现场地质条件,针对传统的CD隧道施工方法存在的不足,提出了双中隔壁台阶法+栈桥施工技术。通过对隧道破损围岩及与其密切溶洞进行预先加固和处理,确保开挖工作面的稳定;施作超前大管棚、超前小导管,与型钢拱架联合发挥棚架作用,避免拱部坍塌的危险,有效减小地表沉降;对中隔壁型钢和开挖断面形状进行优化,使开挖后隧道结构受力均衡,有利于临时和初次支护结构的稳定,减小拱顶下沉;对开挖方式进行优化,将隧道断面分为6块同时开挖,加快了隧洞开挖速度;采用栈桥施工,实现洞内交通、隧洞开挖及初支和二衬施工平行作业,提高施工效率。该技术主要用于地层较差、岩体不稳定且地面沉降要求严格的大跨度隧道施工,既可保证隧道施工安全,又加快了施工进度,取得了显著的经济技术效果。
Based on the large-span tunnel which was excavated by mining method of Zhifang entrance-exit Line of Wuhan metro No. 27th Line, aiming at the shortcomings of the traditional CD tunnel construction method, this paper puts forward the construction technology of the double-middle-door step method and trestle bridge according to the geological conditions in the field. The damaged surrounding rock and its close cavern of the tunnel were pre-reinforced and treated to ensure the stability of excavation face;to avoid the danger of arch collapse and effectively reduce surface subsidence the advancing large pipe shed, advancing small catheter and section steel arch frame were used together as shed frame;the shape of section steel and excavation section in the middle door was optimized, so that the tunnel structure was balanced by force, which was beneficial to the stability of temporary and initial support structure and reduced the sinking of the vault;the excavation mode was optimized, and the tunnel section was excavated simultaneously in 6 pieces, which accelerated the excavation speed of the tunnel;trestle construction was adopted to achieve the parallel operation of traffic and tunnel excavation in the tunnel, as well as the coinstantaneous construction of the first branch and the second lining, so as to improve the construction efficiency. The technology is mainly used for the construction of large-span tunnels with poor strata, unstable rock mass, and strict land subsidence requirements;it can not only ensure the safety of tunnel construction, but also speed up the construction progress, and has achieved remarkable economic and technical results.
作者
张全峰
王松青
徐颖
杨明
汪海波
申五刚
杨新文
ZHANG Quanfeng;WANG Songqing;XU Ying;YANG Ming;WANG Haibo;SHEN Wugang;YANG Xinwen(Urban Traffic Construction Branch,Chinese Coal Third Construction (Group) Co.,Ltd,Hefei Anhui 230000,China;School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan Anhui 232001,China)
出处
《安徽理工大学学报（自然科学版）》
CAS
2019年第5期7-12,共6页
Journal of Anhui University of Science and Technology:Natural Science
基金
国家自然科学基金资助项目(51274009)
安徽省博士后基金资助项目(2018B282)
关键词
大跨度地铁隧道
矿山法施工
优化CD法
快速施工技术
large-span subway tunnel
mining construction method
optimized CD method
rapid construction technology
